5KP45CA-G Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP45CA-G is a bidirectional Zener-type transient voltage suppressor diode manufactured by Comchip Technology, designed for general-purpose overvoltage protection applications. This through-hole component features a 45V reverse standoff voltage with 72.7V maximum clamping voltage and 68.78A peak pulse current capability at 5000W peak pulse power. The part is ROHS3 compliant, active in production status, and available in R-6 axial package configuration with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching or exceeding the core electrical parameters: reverse standoff voltage (45V nominal), breakdown voltage range (50V minimum), clamping voltage performance, peak pulse current handling, and power dissipation capability. Substitutes must maintain bidirectional channel configuration, through-hole mounting compatibility, and general-purpose application suitability.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	5KP45CA-G	—
Manufacturer	Comchip Technology	—
Category	Transient Voltage Suppressors (TVS)	—
Type	Zener	—
Bidirectional Channels	1	—
Voltage - Reverse Standoff (Typ)	45	V
Voltage - Breakdown (Min)	50	V
Voltage - Clamping (Max) @ Ipp	72.7	V
Current - Peak Pulse (10/1000µs)	68.78	A
Power - Peak Pulse	5000	W
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	R-6, Axial	—
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitute parts for the 5KP45CA-G are grouped based on electrical parameter compatibility within the 45V reverse standoff voltage class. The primary substitution criteria are:

Core Electrical Parameters:

Reverse standoff voltage: 45V nominal (±tolerance)
Breakdown voltage minimum: 50V or higher
Bidirectional channel configuration: 1 channel
Type: Zener diode
Through-hole mounting capability

Secondary Compatibility Factors:

Peak pulse current rating: 68.78A or higher preferred for direct substitution; lower ratings acceptable for reduced transient energy applications
Clamping voltage: 72.7V maximum or lower for voltage regulation consistency
Power dissipation: 5000W or higher for equivalent protection; lower ratings acceptable for reduced power applications
Operating temperature range: -55°C minimum and 150°C or higher maximum
Package compatibility: R-6, P600, or DO-15 axial configurations

Substitutes are classified into two groups: Direct Equivalents (matching or exceeding all primary parameters) and Functional Alternatives (meeting core voltage and channel requirements with different power or package specifications).

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Peak Pulse Power (W)	Package	Temp Range (°C)	RoHS Status
5KP45CA-G	Comchip Technology	45	50	72.7	68.78	5000	R-6, Axial	-55 to 150	ROHS3
15KPA45CA	MDE Semiconductor Inc	45	50.3	72.8	207.4	15000	P600, Axial	-55 to 175	ROHS3
30KPA45CA	MDE Semiconductor Inc	45	50.3	77.4	391.5	30000	P600, Axial	-55 to 175	ROHS3
5KP45CA	Littelfuse Inc.	45	50	72.7	70.2	5000	P600, Axial	-55 to 175	ROHS3
P6KE47CA	Diotec Semiconductor	40.2	44.7	64.8	9.7	600	DO-15, Axial	-50 to 175	ROHS3
P6KE56CA	Taiwan Semiconductor Corporation	47.8	53.2	77	7.8	600	DO-15, Axial	—	ROHS3
SA48CA	Taiwan Semiconductor Corporation	48	53.3	77.4	6.7	500	DO-15, Axial	-55 to 175	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Preferred for 1:1 Substitution):

The 5KP45CA manufactured by Littelfuse Inc. is the closest direct equivalent to the 5KP45CA-G. Both parts share identical reverse standoff voltage (45V), breakdown voltage (50V minimum), clamping voltage (72.7V), and peak pulse power rating (5000W). The Littelfuse variant demonstrates marginally higher peak pulse current (70.2A vs. 68.78A) and extended operating temperature range (-55°C to 175°C vs. -55°C to 150°C). Both are ROHS3 compliant and active in production. The primary difference is package configuration: Littelfuse supplies P600 axial package versus Comchip's R-6 axial package. Both are through-hole axial configurations suitable for PCB mounting.

Higher Power Alternatives (For Enhanced Transient Protection):

The 15KPA45CA and 30KPA45CA, both manufactured by MDE Semiconductor Inc., maintain the 45V reverse standoff voltage and 50.3V minimum breakdown voltage while providing significantly elevated peak pulse current and power dissipation ratings. The 15KPA45CA delivers 207.4A peak pulse current at 15000W power, and the 30KPA45CA delivers 391.5A peak pulse current at 30000W power. These parts are suitable for applications requiring greater transient energy absorption. Both feature P600 axial package configuration and extended temperature range (-55°C to 175°C). ROHS3 compliance is confirmed for both variants.

Lower Power Alternatives (For Space-Constrained or Lower-Energy Applications):

The P6KE47CA (Diotec Semiconductor) and SA48CA (Taiwan Semiconductor Corporation) are lower-power alternatives in DO-15 axial package configuration. The P6KE47CA operates at 40.2V reverse standoff with 9.7A peak pulse current and 600W power dissipation. The SA48CA operates at 48V reverse standoff with 6.7A peak pulse current and 500W power dissipation. These parts are suitable for applications with reduced transient energy requirements or where compact package footprint is prioritized. Both are ROHS3 compliant and active in production.

Compliance and Production Status:

All substitute parts listed are ROHS3 compliant and maintain active production status, ensuring long-term availability and regulatory alignment with the original 5KP45CA-G specification.

Frequently Asked Questions (FAQ)

Q: Can the 5KP45CA (Littelfuse) directly replace the 5KP45CA-G (Comchip) in existing designs?

A: Yes. Both parts share identical electrical specifications: 45V reverse standoff, 50V minimum breakdown voltage, 72.7V clamping voltage, and 5000W peak pulse power. The primary difference is package designation (P600 vs. R-6), both of which are through-hole axial configurations with compatible PCB footprints. Verify package dimensions with component datasheets before PCB layout finalization.

Q: What is the difference between the 5KP45CA and the higher-power 15KPA45CA or 30KPA45CA?

A: All three parts maintain 45V reverse standoff voltage and are suitable for the same voltage protection class. The 15KPA45CA and 30KPA45CA provide progressively higher peak pulse current (207.4A and 391.5A respectively) and power dissipation (15000W and 30000W respectively) compared to the 5KP45CA (68.78A, 5000W). Select higher-power variants when transient energy levels exceed the 5000W capability of the standard 5KP45CA.

Q: Are the DO-15 package alternatives (P6KE47CA, P6KE56CA, SA48CA) suitable replacements?

A: The DO-15 alternatives operate within the 45V voltage class but feature significantly reduced peak pulse current and power dissipation (600W to 500W vs. 5000W). These parts are suitable only for applications with lower transient energy requirements. Verify that application transient energy does not exceed the 600W or 500W power rating before substitution. Package footprint differs from R-6 and P600 configurations.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) reverse standoff voltage matching (45V nominal), (2) breakdown voltage minimum (50V or higher), (3) bidirectional channel configuration (1 channel), (4) through-hole mounting type, (5) peak pulse current rating (equal to or exceeding application requirements), and (6) peak pulse power dissipation (equal to or exceeding application requirements). Operating temperature range and RoHS compliance should be verified for specific application environments.

Q: Is the P6KE56CA (47.8V reverse standoff) compatible with the 5KP45CA-G (45V reverse standoff)?

A: The P6KE56CA operates at a higher reverse standoff voltage (47.8V vs. 45V) and is not recommended as a direct substitute. Higher reverse standoff voltage may result in delayed transient suppression response. Use only if application circuit design specifically accommodates higher standoff voltage operation.

Q: What is the operating temperature difference between the 5KP45CA-G and substitute parts?

A: The 5KP45CA-G operates from -55°C to 150°C. Most substitute parts (5KP45CA, 15KPA45CA, 30KPA45CA, SA48CA) extend the upper temperature limit to 175°C. The P6KE47CA operates from -50°C to 175°C. Verify that application operating temperature requirements fall within the selected part's specified range.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the regulatory compliance of the original 5KP45CA-G. REACH compliance status varies by manufacturer; verify specific REACH requirements with component suppliers for regulated applications.

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